[FEAT] add api:overrun_counter

include/spdlog/details/registry-inl.h

@@ -9,6 +9,7 @@
 
 #include <spdlog/common.h>
 #include <spdlog/details/periodic_worker.h>
+#include <spdlog/details/thread_pool.h>
 #include <spdlog/logger.h>
 #include <spdlog/pattern_formatter.h>
 
@@ -256,6 +257,15 @@ SPDLOG_INLINE void registry::shutdown()
     }
 }
 
+SPDLOG_INLINE size_t registry::overrun_counter()
+{
+    std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+    if (!tp_) {
+        return 0;
+    }
+    return tp_->overrun_counter();
+}
+
 SPDLOG_INLINE std::recursive_mutex &registry::tp_mutex()
 {
     return tp_mutex_;

include/spdlog/details/registry.h

@@ -76,6 +76,9 @@ public:
     // clean all resources and threads started by the registry
     void shutdown();
 
+    // get count of lost log
+    size_t overrun_counter();
+
     std::recursive_mutex &tp_mutex();
 
     void set_automatic_registration(bool automatic_registration);

include/spdlog/details/thread_pool-inl.h

@@ -7,6 +7,7 @@
 #    include <spdlog/details/thread_pool.h>
 #endif
 
+#include <spdlog/async_logger.h>
 #include <spdlog/common.h>
 #include <cassert>
 

include/spdlog/details/thread_pool.h

@@ -15,6 +15,7 @@
 
 namespace spdlog {
 class async_logger;
+enum class async_overflow_policy;
 
 namespace details {
 

include/spdlog/spdlog-inl.h

@@ -102,6 +102,11 @@ SPDLOG_INLINE void shutdown()
     details::registry::instance().shutdown();
 }
 
+SPDLOG_INLINE size_t overrun_counter()
+{
+  return details::registry::instance().overrun_counter();
+}
+
 SPDLOG_INLINE void set_automatic_registration(bool automatic_registration)
 {
     details::registry::instance().set_automatic_registration(automatic_registration);

include/spdlog/spdlog.h

@@ -103,6 +103,9 @@ SPDLOG_API void drop_all();
 // stop any running threads started by spdlog and clean registry loggers
 SPDLOG_API void shutdown();
 
+// get count of lost log
+SPDLOG_API size_t overrun_counter();
+
 // Automatic registration of loggers when using spdlog::create() or spdlog::create_async
 SPDLOG_API void set_automatic_registration(bool automatic_registration);